Past perfect vs past simple

Mum ............home at 8 o`clock last night.

• arrived

• had arrived

She was tired because she ................. all day

• worked

• had worked

When she arrived, we ........................dinner.

• already finished

• had already finished

Mum ...............angry because we had made a mess.

• got

• had got

She felt better after we .........................everything up.

• cleaned

• had cleaned

He opened the door after he ................. on his trousers.

• put

• had put

She had cooked when I .................

• arrived

• had arrived

I didn`t see them. They ..................... when I arrived.

• left

• had left

I did the exercise after the teacher ...............it to me.

• explained

• had explained

They ................ the film after they had read the book.

• saw

• had seen